package qilin.pta.toolkits.zipper.cases;

// NO IN , NO OUT, CASE 4.
public class CaseA {
  static class A {
    Object f;
  }

  A create() {
    return new A();
  }

  void foo() {
    Object o = new Object();
    A a = create();
    a.f = o;
    o = a.f;
  }
}
